People have always argued over conspiracy theories. Did the moon landing really happen? Was the Earth at once flat? The list could go on and on. Surprisingly, several celebrities support these theories, and they aren’t afraid to share their opinions with their fans, sparking many debates.

Check out these 15 conspiracy theories celebrities have put at the center of attention. Do you believe them?

1. Lee Harvey Oswald Didn’t Kill JFK

Several people think Lee Harvey Oswald didn’t assassinate President John F. Kennedy on November 22, 1963. This includes actor Bruce Willis, who has publicly stated his beliefs that the real assassin is still in power today.

“They still haven’t caught the guy that killed Kennedy,” Willis said. “I’m pretty sure those guys are still in power, in some form.” 

2. The Government Created AIDS To Kill Off The Black and LGBT Communities

AIDS was first discovered in the 1980s. However, many believe it was a chemical experiment by the CIA to kill people in Africa, but the experiment failed. They believe that then, the CIA sought to kill gay people, igniting a nation-wide fear.

In 2006, rapper Kanye West was asked by Rolling Stone if he believed the theory. He answered that AIDS was created to kill undesirable people.

3. The Earth Is Flat

This might sound crazy, but some people still believe the Earth is flat. This includes rapper B.o.B., who is adamant about his beliefs.

In September 2017, the rapper started a GoFundMe campaign to raise money to buy satellites, launch them into space, and prove that the planet is actually flat. He’s determined to prove that the government is lying to us.

4. Kylie Jenner Is Scared Of Chemtrails

In May 2015, Kylie Jenner tweeted about the dangers of chemtrails. She suggested that airplanes spray hazardous chemicals or biological agents as they soar through the sky. In this theory, the chemtrails control people, alter environmental factors, and cause health problems, including cancer.

Jenner is adamant about this conspiracy theory, even though scientific reports have determined the white streaks are water vapor created when planes fly in certain atmospheric conditions.

5. Michael Jackson Was Murdered

On June 25, 2009, the King of Pop, Michael Jackson, died due to a mix of medications that led to a cardiac arrest. That’s the medical story, but his daughter, Paris Jackson, recently shared her theory that her father was actually murdered.

“It’s obvious,” she said. “All arrows point to that. All real fans and everybody in the family knows it. It was a setup.”

6. Global Warming Isn’t Real

In 2010, singer Ted Nugent wasn’t afraid to tell a group of elementary school children that global warming is a fraud. He has joined other celebrities in stating it’s all a hoax, including Victoria Jackson, Jeremy Clarkson, and President Donald Trump.

But despite these claims, scientists argue global warming is real and we should take it seriously.

7. Hidden Places With Advanced Technology

Will Smith’s son, Jaden, isn’t a stranger to saying insane things. Recently, he stated in an interview that he thinks a place similar to Wakanda, from the Marvel universe, exists in a hidden location on Earth. This place would have advanced technology—more advanced than we could ever imagine.

“The technology that we’re currently at is not the maximum of the human capability,” Smith said. “And that there are places in the world where their technology supersedes what we see here on a daily basis.”

8. Terrence Howard Disagrees With Math

Actor Terrence Howard has developed his own theory of logic. Our concept of mathematics is wrong. In fact, Howard believes one times one equals two, not one.

“How can it equal one?” he asked Rolling Stone. “If one times one equals one that means that two is of no value because one times itself has no effect. One times one equals two because the square root of four is two, so what’s the square root of two? Should be one, but we’re told it’s two, and that cannot be.”

We’ll let the mathematicians tackle this debate.

9. President Obama Organized Mass Shootings

Metallica founder Dave Mustaine believes President Obama organized mass shootings to “pass a gun ban.” He told fans at a 2012 concert that Obama staged all of the mass shootings, including the Aurora movie theater shooting and various school shootings.

Mustaine also believes the conspiracy theory that Obama’s birth certificate is fake.

10. Social Media Controls Your Information

Rapper M.I.A. agreed with the conspiracy theory that Facebook and Twitter were created by the CIA to monitor and control our personal information. According to her, the government shows you what they want you to see.

If you believe this theory, be careful the next time you share too much personal information online.

11. Vaccines Cause Autism

People frequently argue about vaccinations. Do they cause autism or not? Actress Jenny McCarthy started the debate, claiming vaccinations made her son become autistic.

Decades of research disprove this conspiracy theory. But that doesn’t stop celebrities, like McCarthy, Robert De Niro, Rob Schneider, and even President Trump, from arguing with the medical evidence.

12. Vaccines Contain Thimerosal

Comedian Jim Carrey agrees with his ex-girlfriend Jenny McCarthy that vaccines are dangerous. However, he believes a different conspiration theory: that vaccines contain thimerosal. The substance, which includes mercury, is incredibly hazardous to children.

However, this isn’t true in today’s age. Thimerosal hasn’t been used in childhood vaccines since 2001.

13. People Were Cheering On 9/11

In 2015, President Trump supported a conspiracy theory that Arabs in New Jersey were cheering as the World Trade Center was destroyed in a terrorist attack on September 11, 2001.

“It did happen. I saw it. It was on television, I saw it,” Trump claimed.

However, there is no evidence to support the claim.

14. The Government Is Lying About 9/11

Many celebrities, including Martin and Charlie Sheen, Mark Ruffalo, Rosie O’Donnell, and more, have supported the conspiracy theory that the government knew about the 9/11 terrorist attacks.

These celebrities claim the story doesn’t add up to the unfortunate day’s events, and perhaps the government planned the attacks from the very beginning.

15. The Moon Landing Never Happened

When people think of conspiracy theories, they immediately think of the 1969 moon landing. Celebrities, including Whoopi Goldberg, questioned if the Apollo 11 mission actually happened, or if it was filmed on a sound stage.

“Who shot the footage?” Goldberg asked.

MORE: Conspiracy theories about Marilyn Monroe’s death that might just be true.